[sheriff-o-matic]: Basic trooper display for sheriff-o-matic.

Adds trooper feed type & pulling of trooper alerts feed from trooper-o-matic.
Refactors ct-failure-card to accept different card types.
Adds failure card types for sheriff, cq-latency, cycle-time and tree-status.

BUG=399732

Review URL: https://codereview.chromium.org/476903004

git-svn-id: svn://svn.chromium.org/blink/trunk@181431 bbb929c8-8fbe-4397-9dbb-9b2b20218538